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boards/targets/arty: generate 25MHz ethernet clock with S7PLL 

Allow ethernet to work when sys_clk_freq != 100MHz
This commit is contained in:
Florent Kermarrec 2019-05-28 09:55:06 +02:00
parent d7b00c8c4d
commit 675f78304e
1 changed files with 3 additions and 5 deletions
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8
litex/boards/targets/arty.py
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@ -25,6 +25,7 @@ class _CRG(Module):
self.clock_domains.cd_sys4x = ClockDomain(reset_less=True) self.clock_domains.cd_sys4x = ClockDomain(reset_less=True)
self.clock_domains.cd_sys4x_dqs = ClockDomain(reset_less=True) self.clock_domains.cd_sys4x_dqs = ClockDomain(reset_less=True)
self.clock_domains.cd_clk200 = ClockDomain() self.clock_domains.cd_clk200 = ClockDomain()
self.clock_domains.cd_eth = ClockDomain()
# # # # # #
@ -39,14 +40,11 @@ class _CRG(Module):
pll.create_clkout(self.cd_sys4x, 4*sys_clk_freq) pll.create_clkout(self.cd_sys4x, 4*sys_clk_freq)
pll.create_clkout(self.cd_sys4x_dqs, 4*sys_clk_freq, phase=90) pll.create_clkout(self.cd_sys4x_dqs, 4*sys_clk_freq, phase=90)
pll.create_clkout(self.cd_clk200, 200e6) pll.create_clkout(self.cd_clk200, 200e6)
pll.create_clkout(self.cd_eth, 25e6)
self.submodules.idelayctrl = S7IDELAYCTRL(self.cd_clk200) self.submodules.idelayctrl = S7IDELAYCTRL(self.cd_clk200)
eth_clk = Signal() self.comb += platform.request("eth_ref_clk").eq(self.cd_eth.clk)
self.specials += [
Instance("BUFR", p_BUFR_DIVIDE="4", i_CE=1, i_CLR=0, i_I=self.cd_sys.clk, o_O=eth_clk),
Instance("BUFG", i_I=eth_clk, o_O=platform.request("eth_ref_clk")),
]
# BaseSoC ------------------------------------------------------------------------------------------ # BaseSoC ------------------------------------------------------------------------------------------